1 Design and Demonstration of Rich Reagent Injection (RRI) for NOx Reduction at Conectiv’s B.L. England Station

This paper summarizes the design and application of Rich Reagent Injection (RRI) at Conectiv's B.L. England Unit 1, a 138 MW cyclone-fired boiler. Installation of overfire air (OFA) has reduced uncontrolled NOx emissions from ~1.2 lb/MMBtu to ~0.5 lb/MMBtu. An existing SNCR system reduces these emissions an additional 30%. Based on previous modeling of the OFA system, REI’s combustion simulation software was used to design an amine-based injection system for the staged lower furnace and to evaluate NOx reduction performance of the RRI system. Field-testing confirmed modeling predictions and demonstrated that the RRI system alone could achieve 25-30% NOx reduction beyond OFA levels with less than 1 ppm ammonia slip and that RRI in combination with SNCR could achieve 50-55 % NOx reduction with less than 5 ppm slip. The capital costs associated with an RRI system are consistent with those of SNCR